Corresponding Author

Zhi_jun GU


The corrosion behaviors of A3 steel in different pH, 3.5%NaCl, modified zinc phosphate and aluminum triphosphate extract solutions have been studied by EIS. Results show:(a) The resistance increases with the increase of pH value under the same circumstances, but the capacity is the reverse.(b) Zinc phosphate, because of its low solubility, shows no inhibitive performance for A3 steel in 3.5% NaCl extract solutions. (c) Aluminum triphosphate has good inhibitive performance for A3 steel in 3.5% NaCl extract solutions at a pH of 6, probably because the triphosphate ion can complex with the corrosion_product, such as ferric and ferrous ions, and form a compact protective film that separates effectively the steel substrate from the aggressive media at the steel surface. (d) The solubility of the anticorrosive pigment is one of the most important factors for its inhibitive performance.


A3 steel, Pigment extract solution, Electrochemical impedance spectroscopy

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[2] LiangF ,CaoCN ,etal.Oneffectofaddedtitaniumpolyphosphatesandmagneticferricoxidesontheper formanceoforganiccoatings[J].Corrosionscienceandprotectiontechnique,1992,4(2):87.

[3] EvansUR .AnIntroductiontoMetallicCorrosion(3rdedition),PassivityandInhibition[M ].London:E .Arnold.1982:178



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